Segment Congruence postulate: If two segments have the same length as measured by a fair ruler, then the segments are congruent. Also, if two segments are congruent, then they have the same length as measured by a fair ruler.
external image SegmentRotate.jpg Congruent Segments
Segment Addition postulate: If point R is between points P and Q on a line, then PR + RQ = PQ.
The length of a Segment: Let A and B be points on a number line , with coordinates a and b . Then the measure of of segment AB which is called its length , is {a-b} or {b-a}.
Point: exact location (named by a capital letter).
external image Graph3.gif
Congruent Figures: Are figures that are the same size and shapes.
coordiate of a point: A point on a number line that is a real number.
number line: A line that has been set up to correspond with the real numbers.

congruent.gif<--- Congruent Figures